Biofuels: Thermodynamic sense and nonsense |
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| Authors: | Jack W Ponton |
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| Institution: | 1. Boreskov Institute of Catalysis, 5 Academican Lavrentiev Avenue, 630090 Novosibirsk, Russia;2. Research and Educational Center for Energy Efficient Catalysis, Novosibirsk State University, Pirogov Street, 2, Novosibirsk 630090, Russia;1. USDA-ARS Jornada Experimental Range, P.O. Box 30003, MSC3 JER, NMSU, Las Cruces, NM 88003, USA;2. Department of Geological Sciences, University of Texas at El Paso, 591 W. University Avenue, El Paso, TX 79968-0555, USA;1. Dept. Cellular & Molecular Biology, Ribeirão Preto Medical School, University of São Paulo, 14049-900, Brazil;2. National Laboratory of Biosciences (LNBio-CNPEM), Campinas, 13083-970, Brazil;3. Dept. Biochemistry and Immunology, Ribeirão Preto Medical School, University of São Paulo, 14049-900, Brazil;1. Universidade Federal de Santa Maria – UFSM, Brazil;2. Universidade do Estado de Santa Catarina – UDESC, Brazil;3. Centro Universitário Franciscano – UNIFRA, Brazil;4. Instituto Federal Catarinense – IFC, Brazil |
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| Abstract: | Much of the current enthusiasm for biofuels appears to ignore basic thermodynamic and other constraints.The fundamental problem with growing fuel is that combustible plant matter is almost invariably solid, while the major demand for energy at present is in the form of gas or liquid fuels. All current conversion processes are of low efficiency even for the convertible parts of the plant. For example the energy which could be obtained from burning a kilogram of wheat grain is about twice that available from the ethanol into which it can be converted by fermentation. Furthermore, all current liquid fuel processes can use only part of the plant.This paper highlights biofuel technologies which make sense, such as co-firing straw with coal in power stations, and those which because of thermodynamic considerations are nonsense, such as making ethanol from grain in Europe or from maize in the USA.Since arable land is a scarce resource in most of Europe, locally grown biofuels are unlikely to become a major replacement for fossil fuels. Strategies which can help to maximise this contribution are suggested, and promising, emerging technologies are highlighted. |
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